/Engine/Source/Runtime/Engine/Public/AnimationRuntime.h
Lerp forFCompactPose. Stores results in PoseA. For each bone performs BoneA[i] = Lerp(BoneA[i], BoneB[i], Alpha * PerBoneWeights[i]);
static void LerpPosesPerBone ( [FCompactPose](API\Runtime\Engine\FCompactPose) & PoseA, const [FCompactPose](API\Runtime\Engine\FCompactPose) & PoseB, [FBlendedCurve](API\Runtime\Engine\Animation\FBlendedCurve) & CurveA, const [FBlendedCurve](API\Runtime\Engine\Animation\FBlendedCurve) & CurveB, float Alpha, const [TArray](API\Runtime\Core\Containers\TArray)< float > & PerBoneWeights )